Telephone system and the like.



J. SKINDERVIKEN. TELEPHONE SYSTEM AND THE LIKE.

APPLICATION FILED MAY 8, I916.

Patented Aug. 14", 1917.

cs U Int/en or:

um" mum SKINDERVIKEN. TELEPHONE SYSTEM AND THE LIKE[ APPLICATION FILED MAY 8, 916. I

Patented Aug. 14, 19175 a SHEETS-SHEET 2.

J. SKINDERVIKEN.

TE'LEPHONE SYSTEM AND THE LlKE.- APPLICATION FILED 'MA'YB. I916.

1,236,613.. Patented Aug. 14, 1917.

UNITED STATES PATENT OFFICE.

Joann BKINDEBVIKEN, or CHICAGO, unaware-8161163110 s-a uremic comm,

OF CHICAGO, ILLINOIS, A CORPORATION 02 ILLINOIS.

mmrnonn ain'a'rzzu Ann m1: 1.11m.

we n m m i- Patented Aug.'14, 1911.

Application ma ra s, me mm m, 90,205.

-To all whom it may concern Be it known that I, JOHAN SKINDERVIKEN,

a subject of the King of Norway, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and use fulIm-provements in Tele hone Systems and the like, of which the fol owing is aspecifi cation.

The present invention has to do with im- I m provements inarty line telephone systems.

The features 0% adapted. fornse in conjunction with party line systems for rural service, but it willpresently' appearthatthe features are in no wise limited to this particular class of service. y In the usualtype of party line system, the

establishment'of a local circuit between two subscribers or stations ties up the entire party line,-.so that, as long as's'nch first cstablishedconnection' is mamtained, it is not possible to establish any other separate local circuits on such party line. Consequently, the capacity of the entire party line is limited to the carrying on of asingle conversation atone time, and' this is true regardless of the number of subscribers or stations which may be connected into the party lirre.

One of the objects of the present invention is to-provide a s stem wherein a nun);- ber of separate or in ependent circuits may be simultaneously established and maintained on a single party'line, so that twoor more local and private conversations may .35 be simultaneously conducted on said line. This will not only greatly increase the capac-.

ity of the l i 11e,.-butwill also greatly improve! the servicefrom the standpoint of theindr .vidual subscriber, because in many cases it 4 will be possible for 111111 to call and converse privately with the desired party, while other conversations are being simultaneously conducted on other "portions of the line. Furthermore, the transmission is improved, be-

cause the induction affecting the transmis-' sion is confined to the induction on the section of line actually in use.

' It frequently happens that one subscriber on the line is desirous of securing a. private .50 talking connection to another subscriber whose. station is already in service, but that suchpri-vate connection cannot be obtained.

'One of the objects of this invention is to.

i provide means whereby a calling party may ring a party whose stat1on 1s alreariv #1 Service so as to the invention are very well ermit an urgent call to'be delivered. v This eature of the invention also has reference to the provision of an arrangement whereby any station may at any time call central, so that central may receive or deliver anfurgent'message at any time.

Anotherfeature of the invention has-reference to .the provision of an arran ement wherebythe party line may be divit ed up,

by a' very simple operation, into two or more temporary private circuits, each circuit bemg maintained forthe time being independently of the other bemg made, nevert eless, for imme iate connection of anyindividual subscriber to central, and provision also being made for the mstantaneous changing or modification of (sieveral circui so temporarily. estab- 1s e Y Anotherob ect of the invention i is to greatly simpli and im rove certain of the Individual pieces of mec anism which go to make-up the entire system.

Other objects and useswill'appear, from a detailed'description of the invention, which consists in the features of construction and combinations of parts hereinafter described and claimed.

Referring to the drawings: F1g1n-e 1 shows diagrammatically a typirivate circuits, rovision cal eight-party line, including a connection similar to that shown in Fig. 1, with the exception that it is" modified incertain re spects which will presently appear; and Fig. 4 shows one form of mechanism for direct attachment to a telephone instrument, said mechanism embodying'the selector and line restorer contacts in convenient form. 7 Before proceeding to describe in detail eitherof the circuits dia grammatically illustrated. I will state that each station is pro- Q vidcd with what I will designate a lme re-' storer, and with a selectoi. The functlon of the selector is to determine the directions In which. a ring and a conversation will travel along the party line to or from the the station in question, to thereby permitthe selector to control the connecting of the ringing and talking mechanisms in opposite directions as just set forth. Such line-restorer may be conveniently'operated by the operation of the receiver hook, so that the raising of the receiver hook will cause the .line to be opened, whereas the lowering of the receiver hook-will again close the party line circuit.

Referring now to Fig. 1, the party line therein shown includes the wires 4. and 5 which extend out from the central station A to the individual stations B, C, D, E, F, G, H and J; For purposes of convenience I shall call the wire 4 the tip wire, and the wire 5 the-sleeve wire. The connections of the station Eare shown in detail, and are typical of the connections at each of the other stations except the end station J. The station J has the usual bridging type of telephone instrument. The wire 5 is cut at each station, and the terminals 6 and '7 thus formed are carried into the station. A' connection 8 is also carried into the station from the wire 4.

The line-restorer 9 comprises the movable contact 10 in conjunction with the relatively stationary contact 11. When the line-restorer is 'to be automatically operated by the receiver" hook 12, said contacts may be so placedoi mounted that the lowering of the receiver hook brings them together, whereas when the receiver hook rises they will separate so as to open the circuit. Any other suitable means for opening and closing these contacts may be used without departing from the spirit of my invention.

The contact 10 connects to the terminal (3 by a wire 13, and the contact 11 connects to the terminal 7 by a wire 14. Therefore, the lowering of the receiver hook and the simultaneous closing of the line-restorer serve to close the line wire 5 and to cut out the station E. Conversely the raising of the receiver hook will serve to open the line-restorer,,and thereby open the line wire 5 and out in the station E.

A. magneto generator15 and bell 16 are provided for sending and receiving a. call. The selector is designated by the numeral 17; Said selector includes six contacts 18,

, toward the left.

' 7 of the line wire 5.

19, 20, 21, 22 and 23 in conjunction with a button 24. In Fig. 1, said button is shown as having been fully inserted or moved toward the left, and it may be withdrawn or pulled out toward the right. This button has a tapered or wedge-shaped end portion 25 which works between the extending portions of the contacts 19 and 22. When the button is fully inserted as shown in Fig. 1, the contact 19 is driven against the contact 18, and the contact 22 is driven against the contact 23, the contacts 19 and 22 being simultaneously disconnected from the contacts 20 and 21 respectively. On the other hand when the button is withdrawn toward the right, the resiliency of the contacts 19 and 22 will carry them away from the contacts 18 and 23 respectively, and will carry them against the contacts 20 and 21 respectively. The contact .19 is connected by way of the wires 14 and 26 with the right hand terminal 7 of the line wire 5, whereas the contact 22 is connected by means of the wires 13 and 27 to the left hand terminal 6 of the line wire 5. The contact 18 connects by the wires 28 and 29 with the receiver hook, and the contact 20 connects by the wires 30 and 31 to the magneto contact 32. The contact 23 connects by the wires 33 and 31 to the contact 32 of the magneto, and the contact 21 connects by the wires 34 and29 to the re ceiver hook.

The function of the button 24: is to reverse the positions of the contacts 19 and 22. The contact 32 is one of the terminals of the magneto-.- The other side of the magneto connects by the wires 35, 36 and 37 to the terminal 8 of the line wire 4. The terminals of the bell 16 connect respectively by the wire 38 to the receiver hook, and by the wire 39 to the wire 36. 'Whcn' the magneto is actuated, the contact 32 is driven out against the contact 32. It, therefore. follows that, with the button fully inserted, the line-restorer being open, as shown in Fig. 1, the following circuits are established upon actuating the magneto; from the magneto, when actuated, through the contacts 32 and 32, wires 31 and 33, contact 23, contact 22, wires 27 and 13. to the terminal 6 of the line wire 5, through the called station and back over the line wire 1 to the terminal 8 and by the wires 37, 36 and to the magneto. This establishes a ringing connection At the same time there is established another circuit as follows: from the line wire 4, through the terminal 8, and wires 37, 36 and 39 through the bell 16, through the wires 38, 29, and 28, contacts 18 and 19, and wires 20 and 14; to the terminal This establishes a connection to receive an incoming call from the right side of the line. Also, the line-restorcr. being closed, a similar connection is established to the terminal 6 of the line wire 5. If the'line-restorer is open, then a withdrawal of the button :24 toward the right will be found to'reverse these connections, so that the outgolng current generated by the magneto 15 will flowalong the party line toward the right, while an incoming call from the left side of the line will ring the receiver connects by the wire 44 to the Wire372nnd, therefore, to the terminal 8 of the line Wire 4. The other side of the receiver connects by the wire 45 to the secondary 46 of the induction coil.- The common connection 47 of the induction coil connects by awire 48 to the contact 49 above the receiver hooks The uppermost contact 50 4 above the receiver hook connects by way of the wire 51 to the stationary contact 53 ad jacent to the magneto. The lowermost receiver contact 54 connects by way of the wire 55 to one-side of the transmitter, the other side of the transmitter connecting by the wire 56 to the battery, and the other side oi the battery connecting by the wire 57 to the free end of the primary of the induction c il. When the receiver hook is raised, all three of the contacts 49, 50 and 54 are brought together at the same time that the line-restorer 9 is opened. The operation of the magneto serves to move the contact 32 away from the contact 53 and against the contact 32. a

Assuming the receiver hook to be raised, the following circuits are found to be established: If the selector button 24 be fully inserted, as shown in Fig. 1, a talking circuit is established from the line wire 4 and terminal..8 through the wires 37 and 44 to the receiver 40, through the wire 45, secondary 46 and wire 48, through the contacts 49 and 50, through the wire 51, through the contacts 53 and 39, through the wires 52, 31 and 33-, through the contacts 23 and 22, through the wires 27 and 18 to the left hand terminal 6 of the line wire 5. The transmittcr 41 is at the same time connected into this local circuit, including the Wire .55, contacts 54 and 49, wire 48, primary of the induction coil, wire 57, battery 43, and wire 56.

If the button 24 be reversed in position so as to permit the contacts 19 and 22 to disengage from the contacts 18 and :23 respectively and connect with the contacts 20 and 21. it will be found. that the talking circuit, including the receiver 40, and the transmitter 41, is reversed, so that said talking circuit is connected to the terminal 7.0f the line wire 5, thereby permitting the conversation to be carried on over that portion of theparliy line 1 in to the ri ht hand side of the station a g a g An examination of the disclosures, thusfar enumerated will show that the reversal of the position of the button 24, while the l ne-restorer is open, will reverse the connection of the talking mechanism into connection with that portion of the party line lying in either the one direction or the other away from station E along the arty line, according to the position of t e button. Furthermore, when the receiverv hook is depressed so as-to close the line-restorer, it will be found that StatlQlb-E can receive, a ring from either'direction oii the party line, irrespective of the positidii of the button 24, whereas station- E can, after opening the line-restorer, deliver a. ringlalong the party line in the direction whic .may be predetermiiied by the position of the selector button 2 1 F, G, H and J, the station E selector button 24 being in the proper position, and the line-restorer being open, station E ringing circuit will be connected with the right hand side of the line, including stations F, G, H and J, so that a station on said portion of the line may be called by station E without disturbing the portion of the party line lying to the other 'side of station E, and including stations 13, C, and D. In other words, the ringing impulses delivered from station E will pass along the party line in that direction which is determined by the position of the selector button 24. Also the talking portion of station E is simultaneously connected'to the same portion of the party line as that along which the ringing impulses are delivered.

Considering all of the foregoing facts, it will be seen that, by the arrangement thus far disclosed, it is possible to divide up. the multiple party line into a series of more or less independent local talking and ringing circuits, which may be simultaneousl em ployed, provided such local circuits 0 not overlap each other, but simply constitute separate adjacent portions of the total party line. I will now disclose certain features of the invention which permit of ringing from one station past a number of other in termediate stations to a. distant station, and which also permit of carrying on of a conversation with the station so rung, notwithstanding the fact that in so ringing and carrying on a conversation, it is necessary to jump over or overlap an intermediate local circuit the party line.

Bearing in mind the fact that the con- Interposed between the wires 31 and 52 is a key 0r button 58 which I will designate a grounding ringing button. Whensaid key stands normally in the raised position illustrated in Fig. 1, it establishes a connection between the wires 31 and 52. \Vhen, however, it is depressed it connects the wire 52 by a wire 59 to the ground connection 60. I have also provided another key or button 61 which I will calla grounding talking button.- This button normally stands in the raised position illustrated in Fig. 1, but when it is depressed it connects the wire 33 to the, ground connection 60 by. means of the wires 61 and 62. It will be understood that each station may be provided with the aforementioned grounding ringing and grounding talking buttons. Assuming, for example, that a local conversation is being carried on between stations C and D, and that station E desires to call station B, the following procedure may be had: Station E will throw his selector button into the position shown in Fig. 1, which indicates that he is connected to that portion of the party line, including stations D, C and B. Hewill then raise .his receiver and listen, and after ascertaining that stations C and D are using their portion of the circuit, he can call the central station A in the manner presently to be described, and explain that he desires to talk to station B. Central station A will then call B and explain the situation to him, whereupon B will depress his grounding talking button and will then be able to carry on a conversation with station E over a grounded circuit, simultaneously with, and irrespective of, the local conversation oing on between stations C and D. While have specifically mentioned connectlons between certain specified stations, still it will be understood that as far as this feature of the invention is concerned, similar connections and similar results may be accomplished with reference to other combinations of stations on the line. These proceedings may be had by reason of the following constructions: Station A is provided with a drop 63, one side of which is grounded by-the wire 6A and the other side of which connects to the tip side 65 of a jack. The sleeve side 66 of the jack connects to the line wire 5. A special answering ringing plug 67 is provided, the sleeve side of which 1s grounded by a wire 68. When operator E turns his magneto, his grounding ringing button 58 being depressed, current is delivered over the circuit including contacts 32 and 32, wire 52, button 58, wires 59 and 60, ground, wire 64, drop 63, contact 65,

linewire 4, wires 8, 37, 36 and 35 back to the magneto. When the operator at station A observes the dropping of his jack he inserts his special plug, whereupon he may carry on a conversation with station E over the circuit including the tip side of the plug, contact 65, line wire 4, the wires 8 and 37, local Econnections, wire 61, grounding talking button 61, wires 62 and 60,'and through ground back to central station A. When operator A has ascertained from E that it is desired to call B, A will insert a plug of the ordinary type and ring 13. A will then explain to B over a metallic circuit that E desires to talk to him on the ground ed circuit and to press the grounding button, whereupon B will reverse his selector and be placed in direct grounded connection with E. During the ensuing conversation B and R will both retain their grounding talking buttons in closed position.

It will be observed that by means of the connections so far described the calling station is able to deliver his call in the same direction as that in which he desires to talk, without the necessity of reversing the position of the selector after ringing the desired station and before carrying on of the conversation. 1n the arrangement shown in Fig. 3 results similar to those heretofore described are secured with exception that in the present case the outgoing call is directed along the party line in the opposite direction from that in which the talking connection is established. Consequently it is necessary in the arrangement shown in Fig. 3 to reverse the selector between the ringing and talking operations. In the arrangement shown in Fig. 3 one side of the bell 16 connects to the line wire by the wires 39, 36, 37 and 8. The other side of the bell connects by a wire 69 to the contact of the magneto 15, the contact connects by the wire 52 to the grounding ringing button 58, and said button connects by a wire 70 directly to the receiver hook 12 instead of through the selector as in the previous arrangement. Also the wire 36 connects to the magneto by the wire 35 as in the previous arrangement. f

In Fig. 2 I have shown an arrangement similar to that of Fig. 1 with exception that .the second line wire is dispensed with and the system operates purely as a grounded system. In this case the wires 36, 39 and 35 are connected to ground by the wires 71 and 72 respectively, this being equivalent to grounding the wire of Fig, 1. \Vith the arrangement shown in Fig. 2 it is not possible to carry on one local conversation between. two stations. said conversation being superimposed over an intermediate local conversation between two intermediate stations, but many of the other operating possibilities of the arrangement shown in Fig. 1 may be accomplished. For example, with the arrangement shown in Fig. 2 the party line circuits over which independent local conversations may be simultaneously carried on. I

Referring to Fig. A I have therein illustrated a device for direct attachment to any of the well known forms of telephone instrument, said device including the selector,

and line-restorer contacts in convenient form In this case the telephone instrument is designated in its entlrety by the numeral 73.

The transmitter is shown at 7 4: and the receiver hook at 75. The a'ttachment shown in the said figure includes a box-like structure 76, wherein are contained the selector: contacts and the terminals of the attachment, and a box-like structure 77, wherein are contained the line-restorer contacts. Working within the structure 77 is a vertically movable pin 78, the lower end of which may be conveniently attached to the receiver hook by means of a wire or the like 79, so that the raising and lowering of the receiver hook will move said pin up and down. The-said 87 correspond respectively to the wires 29 and 31 of Fig. 1. The terminals 84 and 85 pin carries a ring orcollar 80, of insulating material, which is adapted to engage one of the line-restorer contacts (for example, the contact 10). When the pin 78 is drawn down, the collar 80, by engaging the contact 10, drives the same against the contact 11, whereas when the receiver hook rises, the collar 80 permits the contact 10 to move away from the contact 11, as shown in Fig. 4.

The various selector contacts are mounted within the structure 76, and the button 24: projects from the side of; said structure. Mounted within the structure 76 is a block of insulating material 81, on which are.

mounted the six terminals 82, 83, 84, 85, 86 and 87. The selector contacts 10, and 11, are directly connected to the terminals 82 and 83, respectively. The terminals 82 and 83 correspond to the terminals 6 and 7 respectively, of Fig. 1. The contacts 86 and are directly connected together within the structure 76. The terminal 84 corresponds to the terminal 8 of Fig. 1. The terminal 85 corresponds to theJwire 39 of Fig. 1.

The terminal 82 is directly connected to the contact 22 of Fig. 1, and the terminal 83 is directly connected to the contact 19 of Fig. 1. These connections are made within the body of the structure 76.

When using the attachment just above described in connection with the usual form of telephone instrument, a series of circuits, such as those diagrammatically shown in the several figures, may be obtained, and the attachment above described serves simply as a convenient means for bringing together within a compact structure certain of the contacts and connections.

While I have herein shown and descrlbed only certain embodiments of my invention, still I wish it distinctly understood that I do not'limit myself to said embodiments excent as I may do so in the claims.

Iclaim:

1. In a multiple party line, the combination with a pair of conductors, of a plurality of stations in connection therewith, each statlon including talking devices havin transmitting and receiving instrumentalities, and each station including signaling devices having transmitting andreceiving instrumenta ities, line restoring means and selecting means for each station, each line restoring means. being operable accordingto the position of the telephone receiver hook, and having contacts in series connection with one of the conductors, said contacts being in closed position when the telephone hook is down and being in open position when the telephone hook is up, the selecting means havmg-commutating contacts bridged across the contacts of the line restoring means, permanent connections from one side of the talking devicesto the other conductor, connec tions between the other side of the talking devices and the coinmutating contacts of the selecting means for connecting said side of the talking devices to either side of the line restoring means as desired according to the from one side of the signaling devices to the last mentioned conductor, and connections from the other side of the transmitting signaling devices for connecting the said devices simultaneously to the same contact of the line restoring means as is in communication with the talking devices when the selecting meansis in any given position, means for temporarily grounding one side of the talking devices, and means for temporarily grounding'one side of the signaling devices, for the purpose specified.

2. In a multiple party line, the combination with a pair of conductors, of a plurality of stations in connection therewith, each station including talking devices having transmi'tting and receiving instrumentalities, and each station having signaling devices including transmittingand receiving instrumentalities, line restoring means, selecting means for each station, connections for placing each line restoring means in series with one of the conductors, commutating contacts for the selecting means, connections from two of said contacts to the contacts of the line restoring means, permanent connections from one side of the talking devices and from one side of the signaling devices to the other conductor, connections from the other side of the talking devices, and from the other side of the transmitting signaling devices to desired contacts of the selecting means for the purpose of simultaneously connectlng the talking devices and the signaling devices to a selected contact of the line restoring' and including signaling devices having.

transmitting and receiving instrumentalities, selecting means and line restoring means for each station, contacts in the line restor ing means, connections for placing said contacts permamzntlv in series with one conductor, cc/inmutating contacts in the selecting means, connections from said contacts to the contacts of the line restoring means, permanent connections from one side of the talking devices to the other conductor, permanent; connections from one side of the signaling devices to said conductor, and connections from the other side of the talking devices and from the other side of the transmitting signaling devices to the selecting means for the purpose of simultaneously connecting the same to the same contact of the line restoring means when the selecting means is in any given position, for the purpose specified.

4. In a multiple party line, the combination with a pair of conductors, of a plurality of stations in connection therewith, each station including talking devices having transmitting and receiving instrumentalities and including signaling devices having transmitting and receiving instrumentalities, line restoring means and selecting means for each station, each line restoring means having contacts, connections for placing said contacts in series with one conductor, each selecting means having commutating contacts, connections from said contacts to the contacts of the line restoring means, permanent connections from one side of the talking devices and from one side of the signaling devices to the other conductor, connections from the other side of the talking devices to the selecting means for the purpose ofconnecting the same to either of the contacts of the line restoring means according to the position of the selecting means, connections from the other side of the transmitting instrumentality of the signaling devices to the selecting means for the purpose of delivering signaling impulses to the same contact of the line restorer as that to which the talking devices are connected when the selecting means stands in any given position, and connections from the receiving instrumentality of the signaling devices to the other contact of the line restoring means when the selecting means stands in said position, for the purpose specified.

5. In a multiple party line, the combination with a pair of conductors, of a pluralit of stations in connection therewith, eac station including talking devices having transmitting and receiving instrumentalities and each station including signaling devices having transmitting and receiving instrumentalities, line restoring means and selecting means for each station, each line restor ing means having a pair of contacts, connections for placing said contacts in series with one of the conductors, permanent connections from one side of the talking devices to the other conductor, permanent connections from one side of the signaling devices to said conductor, each selecting means having commutating contacts, connections from said contacts to the contacts of the line restoring means, connections from the other side of the talking devices to the selecting means for the purpose of connecting the same to either of the contacts according to the position of the selecting means, connections from the other side of the transmitting instruinentalities of the signaling devices to the selecting means for the purpose of simultaneously connecting the same to the same contact of the line restoring means as the talking devices when the selecting means is in any given position, connections from the other side of the receiving instrumentality of the signaling devices to both of the contacts of the line restoring means when the same is in closed position, means for temporarily grounding the talking devices, and means for temporarily grounding the signaling devices, for the purpose specified.

6. In a multiple party line, the combination with a conductor, of a plurality of stations in connection therewith, each station including talking devices having sending and receiving instruinentalities and each station including signaling devices having transmitting and receiving instrumcntalities, line restoring means and line selecting means for each station, each line restoring means having a pair of contacts, connections for placing said contacts in series with the conductor, permanent connections from one side of the talking devices to another conductor, permanent connectionsfmm one side of the signaling devices to said conductor, each selecting means having connnutating contacts;; connections from said contacts to the contacts of the line restoring means, connections from the other side of the talking devices to the selecting means for the purpose of connecting said side of the talking devices to either of the contacts of the line restoring i means according to the position of the se-' lecting means, connections from the other side of the transmitting instrumentalities of the signaling devices to the selecting means for the purpose of simultaneously connecting the same to the same contact of the line restoring means as the talking devices when the selecting means is in any given position, and connections from the other side of the receiving inst-ru nentalities of the signaling devices to both of the contacts of theline restoring means when the same is in closed position, for the purpose specified.

7. In a multiple party line, the combination with a pair of conductors, one of which is severahle, of a plurality of stations in connection therewith, each station including talking devices having transmitting and receiving instrumentalities vand each station including signaling devices having trans-.

initting and receiving instrlnnentalities, line restoring means, and selecting means for each station, wires in connection with the line restoring means and the severable conductor for-the purpose of controlling the severance of said conductor, wires in connection with the selecting means for the purpose ofconnecting one side ofthe talking devices to one end or the other of the severalile conductor according to the position of the selecting means and for Slllltll taneouslv connecting one side of the transmitting signaling devices to the same end of the sever-able conductor as that just mentioned, and wires for connecting the other side-of the talking devices and the other side of the signaling devices to another conductor, for the purpose specified.

8 In a multipleparty line, the combination with a pair of conductors, one of which is severable, of a plurality of stations in connection therewith, each station including talking devices having transmitting and receiving instrumentalities and each station including signaling devices having trans-- mitting and receiving instrumentalities, line restoring means and selecting. means for each station, wires in connection with the line restoring means and the severable' conductor for the purpose of controlling the severance of said conductor, wires in 0011- nection with the selecting means for the pur pose of connecting one side of the talking devices to one end or the other ofthe sev erahle conductor according to the position" of the selecting means, and 'for simultaneously connecting one side of the transmitting signaling devices to one end or the other of the severable conductor, and wires for connecting the other side of the talking devices and the other side of the signaling devices to another conductor, for the pur: pose specified.

J OHAN SKINDERVIKEN. Witnesses: I

Fnaxcrs M. Fnosr, THOMAS A. BANNING, Jr. 

